Tube expanding mill



June 18, 1935. B. c.- MOlsE- TUBE EXPANDING MILL Filed Feb. 25, 1932 2 Sheets-Sheet 1 [now 502:

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fi/is War/7496.

June 18, 1935. a. c. MOISE TUBE EXPANDING MILL I Filed Feb. 23, 1952 2 Sheets-Sheet 2 1760676507: 50L TON CI fife/6E, 55' V W v m Patented June 1 8, 1935 UNITED STATES PATENT} OFFICE z,oo5,1ss TUBE EXPANDING mm. Bolton 0. Moise, Pittsburgh, Pa. Application February 23, 1932, Serial No. 594,621

1 Claim. torso- 13) My invention relates to seamless pipe and tube mills, and particularly to expanding and rolling mills. In these mills a set of rolls draws rough pierced shells over a mandrel supported on a long rod. When the shells firstpass over the mandrel and begin to travel forward over this rod, it is possible to use rod supports. These supports must soon be withdrawn, however, to permit the tubes travel over the major portion of the rod, leaving the latter quite unsupported and free to whip so that it cannot hold the mandrel in the tube cenand providing a ram having a bearing surface that may coact with that oi. the mandrel and arranged to push rough shells over the latter. A set of rolls are positioned on either side of this mandrel in the ordinary manner and the rest of the mill is generally conventional.

As the ram pushes a shell through these rolls and over this mandrel, the latter may be supported or steadied by the ram through the medium of the pair's coacting bearing surfaces. In addition, the ram may be run at a speed that relieves the rolls of the burden of moving the shells, thus practically eliminating any roll slippage.

A specific example of a seamless tube mill'constructed according to my invention is illustrated by the accompanying drawings, Figure 1 being a cross-sectioned side elevation and Figure 2 a partially cross-sectioned plan.

This mill includes a pair of rolls I arranged on either side of a mandrel 2 carried by a thrust bar I. These rolls are the conventional axially inthe mandrel of a tube mill with a bearing surface,

clined disk rolls thatboth shape and draw the shells over the mandrel.

In the present instance, these rolls are relieved, or at least partially relieved, of the burden of longitudinally moving the shells, by a ram 4 5 mounted in a thrust bearing 5 carried by a slide 6 which is moved by a cable and drum arrange- 1 ment I driven by a motor 8. Thismotormay' be operated continuously to first forcibly start 1 the shells and then drive them completely over 10 the mandrel 2. v

The bearing surfaces for the mandrel and ram consist of a rod extension 9 carried by the former and a bore lliformed in the latter. As the ram pushes the last portion of a shell over the mandrel 15 this extension enters the bore so that the ram acts as a steadying agency. The ram is then run back to permit the entrance of another shell into the mill.

Although I have shown aspeciflc form of my 2 invention in accordance with the patent statutes, I do not intend to limit its scope thereto, except as defined by the following claim.

I claim: 25

A tube rolling mill including the combination of a set of working rolls constructed and arranged to continuously engage the work during each rolling operation, a mandrel, means for continuously holding said mandrel at a predetermined position. 30 between said rolls, a ram for engaging the rear end of said work, means for mounting said ram for continuous movement for a distance at least equaling the length of said work' and means for applying continuous force directed towards said 35 mandrel to said ram during the rolling operation of said mill, said mandrel and ram having coacting portions that'are'constructed and arranged to positively interengage whensaid ram approaches said; mandrel.

BOLTON C. MOIBE. 

